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+--- Thread: Clutch slip (/showthread.php?tid=4820)
Clutch slip - Dave Mann - 19-08-2020
I've been asked to look at a Seven which suffers clutch only when negotiating a hill on a bend with no bother on a straight hill. Anybody any bright ideas as to what is going on?l
RE: Clutch slip - Alan - 19-08-2020
You sure it’s clutch slip and not wheelspin? Otherwise first thing I’d look at is are the engine mounts tight.
RE: Clutch slip - David Witton - 19-08-2020
Halfshaft key shearing on taper? Some years ago pal of mine had similar symptoms and that was the cause
RE: Clutch slip - Ian Williams - 19-08-2020
Agreed half shaft key failure, is the first thing I would look at.
RE: Clutch slip - Dave Wortley - 20-08-2020
Probably not much help Dave but my chummy also has this problem when exiting our drive. Very steep at the top bit and a full left hand lock. No slip anywhere else. I sold it to Tony Griffiths so he might know the cure.
RE: Clutch slip - Tony Griffiths - 20-08-2020
(20-08-2020, 11:15 AM)Dave Wortley Wrote: Probably not much help Dave but my chummy also has this problem when exiting our drive. Very steep at the top bit and a full left hand lock. No slip anywhere else. I sold it to Tony Griffiths so he might know the cure.Indeed - it is very strange indeed. And no, it's not the half-shafts; I did the rear brakes a few weeks ago and the keys and tapers were in first-class-engineered-blue-split-pins-dead-in-line-through-the-holes-previously-assembled-by-an-expert order. No doubt, when it comes apart, we'll find out what the gremlin is!
RE: Clutch slip - Alan - 20-08-2020
When you apply left lock it unloads the LH rear wheel. Particularly if the dampers are a bit loose. With less load the wheel has less grip and if you apply sufficient torque it will spin. That’s what’s happening. The clutch doesn’t know if it’s in a corner or not.
RE: Clutch slip - Tony Griffiths - 20-08-2020
(20-08-2020, 10:20 PM)Alan Wrote: When you apply left lock it unloads the LH rear wheel. Particularly if the dampers are a bit loose. With less load the wheel has less grip and if you apply sufficient torque it will spin. That’s what’s happening. The clutch doesn’t know if it’s in a corner or not.There was a slight error in the reporting; it's not turning off-camber and so unloading the inside wheel and causing it to spin, but making a right-angle turn, left or right, before going straight up a steep hill that (sometimes) causes the clutch slip. Approach the hill straight on - and there is no slip.
RE: Clutch slip - Alan - 21-08-2020
So, to be clear, do you mean the slip takes place on a straight action of hill AFTER you have turned a sharp corner onto it? If so, is it instantaneous or does it last a while?
RE: Clutch slip - Bob Culver - 21-08-2020
I hope this gets sorted soon. The concept of a taper slipping to the extent that it can be mistaken for clutch slip is keeping me awake at nights!
(Sevens can produce curious effects. Decades ago a young mechanic apprentice lived near me. I was the only other Seven owner for miles so we often compared notes on our "motoring". Out one Saturday night there was a bang and his Seven mysteriously commenced to torque steer left and right.....all the way home. His Trade classes had not covered that.)